Bending jig.



F C. FISCHER.

I BENDINGJIG. APPLICATION FILED NOV. 19, 1919.

Patented June 13, 1922.

. M vemor: Frede /b/r C. Escher UNHTED FREDERICK c. rr's'ciina, orERWYN. rumors, ASSIGNOB TO wns'rnan 'nLEc rRIc COMPANY, INCORPORATED, ornew YORK, 1v. an, .A CORPORATION or New YORK.

IBENDING are.

isses.

Application filed November 19, 1919.

T 0 all whom it may concern:

Be it known that I, Fnnnnnrox C. Frsorrnn, a citizen of the UnitedStates, residing at Berwyn, in the county of Cook, State of Illinois,have invented certain new and use ful Improvements in Bending Jigs, ofwhich the following is a full, clear, concise, and exact description.

My present invention relates to jigs and special tools for manufacturingprocesses and more particularly to the manufacture of vacuum tubes.

The object is to provide a simple and convenient jig for forming therequired bends in the supporting wires of the tube stems.

To these and other ends the invention resides in certain improvementsand combinations of parts which will be described later and the novelfeatures pointed out in the claims at the end of this specification.

In the drawings, Fig. 1 is a perspective view of a jig constructed inaccordance with and illustrating one embodiment of my invention andshowing a stem in place therein after the wires have been formed; andFig. 2 is a perspective view of the finished article in the manufactureof which the jig is utilized.

Similar reference numerals throughout the views indicate the same parts.

Referring first to the tube shown in Fig. 2 and to the stem thereofshown in Fig. 1, the said stem, indicated at A, contains the leadinwires B, and also an offset extension or post C, in which post variouspairs of supporting wires D, E, F, G and H are carried. In the presentinstance we are concerned only with the pairs of wires 1) and G, whichsup port the grid K shown in Fig. 2.

There is provided a yoke shaped member 1 which may be fastened to thebench by the devices 2 and the upwardly extending arms 3 of whichconstitute spaced standards. The upper ends of these standards arerespectively notched at 4 and 5 to provide aligned seats for the stem,the first being occupied by the tip of the extension C, and the secondbeing occupied by both the extension and the lead wires B, which latterrest in the bottom of the notch and support the inner end of the stem.The end of the main stem A from which these lead wires project abuts thestandard at the base of the seat and defines the position of the articlein the jig.

The walls of the notched seats 4 and 5 Specification of Letters Patent.Patented Jung 13 1922.,

Serial No. 339,181.

tioned in the jig the pairs of wires-D and G come adjacent to theseposts, respectively, and are bent laterally around them, as shown inFig. 1, giving them a preliminary bend in one plane. They are then bentin a relatively transverse plane by being formed downwardly along thearms 8 and 9. These arms are given the desired conformation to producethe proper angular relationship of the bends in the wire, the arms 8having a straight face and the arms 9 having an inclined face forcontact with the wire.

The lead-in wires B occupying the deeper seat notch 5 extend within theyoke in a protected position, while the filament supporting wires Hproject beyond the jig so that neither interferes or is interfered withduring the bending operation.

hat is claimed is:

1. A jig for the supporting wires of a vacuum tubestem comprising asupport having a depressed seat adapted to receive said stem andupstanding posts adjacent said seat around which the wires may beformed.

2. A jig for the supporting wires of vacuum tube stems comprising adepressed seat for the stem embodying upstanding posts around which thewires may be formed, and arms extending laterally from the posts toreceive the wires for a further bend in a relatively transverse plane.

3. A for the supporting wires of vacuum tubes comprising a pair ofspaced standards, notched to provide seats for the tube stem and havingposts adjacent to the seats around which the wires carried by the stemmay be formed.

41. A jig for the supporting wires of vacuum tubes comprising a yokehaving notches in the ends of its arms to provide a seat for the stem,the walls of the notches comprising posts having laterally extendingarms, and around which the wires may be bent in two relativelytransverse planes.

5 A jig for a vacuum tube stem having supporting wires projectingtherefrom, said jig comprising spaced supports for the stem andprojections arising from each of said supports around which the wiresmay be formed.

6. A jig for a vacuum tube stem having supporting wires projectingtherefrom comprising a support for the stem, a projection from saidsupport around which one of said wires may be bent in one plane and, asecond projection around which said last mentioned wire may be bent in adifferent plane.

7. A jig for a stem having a wire projecting therefrom comprising asupport for carrying the stem and a pair of projections eX- tending fromsaid support at an angle to each other around which the wire may beformed.

8. A jig for a vacuum tube stem having two port-ions and supportingwires projecting from each of said portions, said jig comprising asupport for the wires projecting from one of said portions, a projectionfrom said support around which one of the wires from said body portionmay be formed, and a support for the wires extending from the otherportion.

9. A jig for a stern having two parallel portions, a wire projectingfrom each of said portions, supports for the wires projecting from eachof said portions and posts projecting from the support for one of saidportions around which the wire of the other portion may be formed.

In witness whereof, I hereunto subscribe my name this 1 1 day of Nov.,A. D. 1919.

FREDERICK C. FISCHER.

